10908137domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers k such that (j^k + k^j) == 0 (mod k+j), j=2 case.at n=30A114977Odd numbers k with the property that (2^k + k^2) == 0 (mod (k+2)).at n=4A156038Odd prime numbers p with the property that (2^p + p^2) == 0 (mod (p+2)).at n=1A156048Prime numbersat n=720845